DFRobot SEN0237-A Gravity Analog Dissolved Oxygen (DO) Liquid Sensor Kit, 0–20 mg/L Galvanic Probe, 3.3–5.5 V, BNC — For Arduino/Raspberry Pi/ESP32

Overview

DFRobot SEN0237-A is an analog dissolved oxygen (DO) liquid sensor kit that measures oxygen content in water to assess quality for aquaculture, hydroponics, and environmental monitoring. It pairs a galvanic DO probe (no polarization time) with a Gravity signal converter board (3.3–5.5 V input, 0–3.0 V analog output) for easy connection to Arduino, Raspberry Pi (via ADC HAT), ESP32, and other microcontrollers.

Key Features

• Galvanic DO probe — ready-to-use, no polarization delay.

• Low maintenance — replaceable membrane cap and refillable electrolyte.

• Wide compatibility — Gravity interface, 3.3–5.5 V supply, 0–3.0 V analog output.

• Practical range — measures 0–20 mg/L DO with fast response (≤90 s to 98% at 25 °C).

• Rugged build — 0–50 PSI pressure rating and 2 m cable with BNC connector.

Specifications

Dissolved Oxygen Probe

• Type: Galvanic

• Measurement Range: 0–20 mg/L

• Response Time: ≤90 s to 98% (25 °C)

• Pressure Range: 0–50 PSI

• Service Life: ~1 year (typical use)

• Maintenance:

  • Membrane cap replacement: 1–2 months (muddy water), 4–5 months (clean water)

  • Filling solution replacement: ~1 month

• Cable Length: 2 m

• Connector: BNC

Signal Converter Board

• Operating Voltage: 3.3–5.5 V

• Output: 0–3.0 V analog

• Probe Connector: BNC

• Signal Connector: Gravity Analog (PH2.0-3P)

• Dimensions: 42 × 32 mm

Compatibility & Applications

• MCUs/Boards: Arduino, ESP32, and Raspberry Pi (requires ADC module/HAT).

• Use Cases: Aquaculture, hydroponics, environmental water testing, education, lab experiments.

Important Notes & Safety

• Electrolyte required: Filling solution is not included due to air-transport regulations. Use 0.5 mol/L NaOH; fill the membrane cap before first use.

• Corrosive liquid: Wear gloves; if contact occurs, rinse skin thoroughly with water.

• Handle with care: The oxygen-permeable membrane is fragile—avoid sharp objects.

• Measurement tip: The probe consumes a small amount of oxygen; gently stir the sample for uniform readings.

Package Contents

• Galvanic Dissolved Oxygen Probe with Membrane Cap ×1

• Spare Membrane Cap ×1

• Signal Converter Board ×1

• Gravity Analog Sensor Cable ×1

• Waterproof Gasket ×2

• Screw Cap for BNC Connector ×1

• Plastic Dropper ×2

Details

DFRobot Gravity Dissolved Oxygen Sensor V1.0 by DFRobot, featuring a compact design with measurement scale for size reference.

DFRobot SEN0237 Dissolved Oxygen Sensor V1.0 connects to a DFRduino UNO v3.0 via analog input. It includes a probe connected by a cable, with power and signal wires. VCC, GND, and signal pins link to the microcontroller’s 5V, GND, and A0. This setup measures dissolved oxygen in water, ideal for environmental monitoring.